Earphone microphone

Abstract

An earphone microphone includes a main body housing, a differential microphone, and a speaker. The main body housing defines first and second acoustic spaces therewithin. The main body housing has a first opening that communicates the first acoustic space with an outside of the main body housing and a second opening that communicates the second acoustic space with the outside of the main body housing. The second acoustic space forms a Helmholtz resonator relative to sound propagating through the second opening. The differential microphone has first and second sound collection holes. The first and second sound collection holes communicate with the first and second acoustic spaces, respectively. The speaker is disposed in the second acoustic space.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to Japanese Patent Application No. 2013-025246 filed on Feb. 13, 2013. The entire disclosure of Japanese Patent Application No. 2013-025246 is hereby incorporated herein by reference.BACKGROUND[0002]1. Field of the Invention[0003]This invention generally relates to an earphone microphone. More specifically, the present invention relates to an earphone microphone having a speaker and a microphone.[0004]2. Background Information[0005]Generally, earphone microphones with a built-in speaker and microphone are well-known in the art. The user listens to a speaker's voice or other such sound outputted from the speaker through the earphone microphone, which is worn in the ear, while the user's voice inputted to the microphone is transmitted. Therefore, this earphone microphone is utilized in hands-free communication with a portable telephone or the like.[0006]However, the sound emitted by the speaker into the exte...

AI Technical Summary

Benefits of technology

The technical effect of this patent text is to create a small earphone microphone that is simple and inexpensive, and has the ability to suppress echoes effectively.

Problems solved by technology

However, the sound emitted by the speaker into the external auditory canal reverberates at the user's eardrum, in the external auditory canal, etc., and is inputted as noise (an echo component) to the earphone microphone.

Therefore, a problem is that the echo component is admixed as noise into the sound transmitted from the earphone microphone.

Therefore, it has been discovered that it is more difficult to make the main body housing compact.

Also, since manufacturing costs are higher, another problem is the relatively high cost.

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